will download the latest 2.x version of jrburke/requirejs from GitHub.

2. volo add mentions possible incompatibilities after doing a nested dependency install, and gives commands for manually choosing one of the other versions.

3. volo now has a simple web site that hopefully gives a better idea intro to volo. Many thanks go to James Long for starting the structure and helping to refine its message. There is more to do for the site, but it is already much better than what was there before.